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This reverts commit 7a0899d6.

- update chat docs
- add messages chat endpoint
- remove deprecated context and template generate parameters from docs
- context and template are still supported for the time being and will continue to work as expected
- add partial response to chat history

Co-authored-by: rootedbox

* add `"format": "json"` as an API parameter
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Co-authored-by: Bruce MacDonald <brucewmacdonald@gmail.com>

- add the optional `raw` generate request parameter to bypass prompt formatting and response context
-add raw request to docs

move the empty response so it's more visible

unused after removing EMBED

- only reload the running llm if the model has changed, or the options for loading the running model have changed
- rename loaded llm to runner to differentiate from loaded model image
- remove logic which keeps the first system prompt in the generation context